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Stockholders' Equity (Details 5)	Dec. 31, 2013
Warrants outstanding
Warrants outstanding	1,591,795
Weighted Average Exercise Price (in dollars per share)	17.06
February 2007 stock issuance
Warrants outstanding
Warrants outstanding	151,773
Weighted Average Exercise Price (in dollars per share)	59.08
July 2009 Series II stock issuance
Warrants outstanding
Warrants outstanding	98,893
Weighted Average Exercise Price (in dollars per share)	7.00
January 2010 stock issuance, one
Warrants outstanding
Warrants outstanding	101,785
Weighted Average Exercise Price (in dollars per share)	22.82
January 2010 stock issuance, two
Warrants outstanding
Warrants outstanding	100,714
Weighted Average Exercise Price (in dollars per share)	19.95
October 2010 stock issuance
Warrants outstanding
Warrants outstanding	594,513
Weighted Average Exercise Price (in dollars per share)	13.44
July 2011 stock issuance
Warrants outstanding
Warrants outstanding	544,117
Weighted Average Exercise Price (in dollars per share)	9.52

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i)(4))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph i

-Subparagraph 4

-Article 4

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- Definition

Number of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph i

-Article 4

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